Fig. 2. Neural breathing variability and extubation outcomes.

MV mechanical ventilation, ETT-CPAP endotracheal tube continuous positive airway pressure, CV coefficient of variation, NTi neural inspiratory time, SDSD standard deviation of successive differences, BB breath to breath. Respiratory variability parameters during MV and ETT-CPAP significantly differ between infants with extubation success (S) or failure (F); p value *<0.05 and **<0.01 using the Wilcoxon’s rank sum.